US-led forces in Afghanistan say they have been involved in a major battle against suspected Afghan insurgents in the southern Kandahar province.
A suicide bomber has killed six people at a market in the eastern Afghan province of Paktika, officials say.
More than 100 militants were reported to have been killed, but there was no independent confirmation of the figure.
Four civilians and two Afghan soldiers died along with the bomber in the blast in Barmal district, the governor said. A number of others were hurt.
A statement said fighting erupted when insurgents ambushed a joint Afghan-US force in Shah Wali Kot. Aircraft bombed the insurgents' positions.
Earlier, US-led forces said they had killed over 100 militants in southern Kandahar province. There was no independent confirmation of the figure.
Earlier, a suicide bomb in eastern Paktia province killed three US troops.
Attacks have soared in Afghanistan, with over 3,000 people killed in 2007.
The troops were helping to build a bridge, AP news agency quoted an unnamed US official as saying.
'Major battle'
The US-led coalition also said three of its troops and two Afghan soldiers were killed in eastern Kunar province on Sunday.
The blast in Barmal targeted soldiers who were shopping, Paktika Governor Akram Khpelwak said.
Attacks have soared in Afghanistan, with more than 3,000 people killed in 2007.
It was the second in the east of the country in as many days. A suicide bombing in neighbouring Paktia province killed three US troops on Tuesday.
Air support
The troops were helping to build a bridge, the Associated Press news agency quoted an unnamed US official as saying.
In clashes in Kandahar province, soldiers were attacked from several positions with machine guns, rocket-propelled grenades and mortars, according to an alliance statement.
Three US-led coalition troops and two Afghan soldiers were killed in eastern Kunar province on Sunday.
An Afghan security forces member was killed and three international and three Afghan troops wounded, the statement said.
In Kandahar province in the south, US-led forces said they had been engaged in a major battle with militants.
In the clash in Kunar province, 10 other coalition troops were wounded on Sunday, the coalition said.
A statement said fighting erupted when insurgents ambushed a joint Afghan-US force in Shah Wali Kot. Aircraft bombed the insurgents' positions, it said.
It said up to 22 militants had been killed in two other clashes in the south. There was no immediate reaction to the reports from the Taleban.
Soldiers were attacked from several positions with machine guns, rocket-propelled grenades and mortars, according to the statement.
Statements from the coalition said that all the incidents were sparked by ambushes from insurgent forces.
An Afghan security forces member was killed and three international and three Afghan troops wounded, it added.
In the other incidents, in the southern provinces of Helmand and Kandahar, the coalition said insurgents had been repulsed by Afghan government forces acting with coalition supervision.
There was no immediate reaction to the reports from the Taleban.
In the Helmand encounter, it said 12 rebels had been killed after Afghan forces called in coalition air support, which helped identify targets but did not engage the insurgents.
